Overflow Nozzle 1/4in Barb 4pk

The ALLSTAR PERFORMANCE Overflow Nozzle 1/4-inch Barb 4-pack (SKU ALL30178-4) delivers reliable coolant and overflow system management for high-performance engines and cooling applications. This straight-design nozzle set provides a straightforward solution for diverting excess coolant away from critical engine components, with the 1/4-inch barb connection fitting standard hose sizing found on most automotive cooling systems.

Each nozzle is constructed from aluminum and finished in black anodized coating, a standard choice in motorsports applications where corrosion resistance and durability under underhood conditions matter. The anodized treatment protects the aluminum substrate from oxidation and thermal cycling stress—critical factors in race engines and modified cooling setups where overflow management prevents air locks and maintains system pressure integrity. The 1/4-inch barb design creates a secure friction-fit connection to compatible tubing, eliminating the need for additional clamps on low-pressure overflow lines.

This four-pack format serves builders and shops managing multiple vehicles or those building redundancy into cooling systems. ALLSTAR PERFORMANCE, known for practical engine-bay components and plumbing solutions, positions these nozzles for street performance, drag racing, circle track, and engine-building applications where custom cooling layouts are common. The straight configuration allows flexible routing without sharp bends that restrict flow or create turbulence in the overflow circuit.

Overflow nozzles like this one address a specific but essential cooling system function: preventing coolant from backing up into the radiator cap vent when the system pressurizes and cools. Proper overflow management extends radiator life, maintains consistent cooling performance, and prevents the air ingestion that can cause hot spots in the cylinder head. Builders who prioritize cooling system reliability—whether in street machines, competition vehicles, or engine swaps—rely on these fittings as foundational components.